CN109728577B - Power supply system and control method thereof - Google Patents
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Abstract
The invention discloses a control method of a power supply system, which is suitable for controlling the power supply system with a plurality of current sources. These current sources are connected in series with each other. The control method of the power supply system comprises the following steps: measuring the voltage difference of two connecting ends of each current source to obtain a plurality of voltage difference signals; calculating a voltage equalizing signal according to the voltage difference signals; and generating a plurality of correction signals according to the voltage equalizing signal and the voltage difference signals to respectively adjust a plurality of output currents of the current sources, wherein the correction signals are respectively related to a plurality of differences between the signal value of the voltage equalizing signal and the signal value of the voltage difference signals. The invention also discloses a power supply system.
Description
Technical Field
The present invention relates to a power supply system and a control method thereof, and more particularly, to a power supply system with a plurality of current sources and a control method thereof.
Background
In practice, the power supply system generally has a plurality of power sources to adapt to loads of different specifications. The power supply system can be switched to a voltage source or a current source according to the requirement. In the prior art, simply connecting multiple voltage sources in parallel or connecting multiple current sources in series is technically impermissible. In the prior art, one of the two dc power supplies is set as a current source, and the other of the two dc power supplies is set as a voltage source. Under the structure, one of the direct current power supplies set as a current source is used for actively adjusting current or adjusting voltage according to load conditions; the other DC power source is used to actively adjust the voltage or adjust the current according to the load condition.
However, under this configuration, at the moment of voltage variation of the load, the instantaneously increased voltage or the decreased voltage must be reacted by one of the dc power sources (set as a current source). That is, only a single DC power supply is used to bear the voltage variation. Similarly, at the moment of load current variation, either the momentary increase or decrease in current must be reacted by one of the dc power sources (set as the voltage source). That is, only a single DC power supply is used to bear the current variation. In other words, although such a structure is intuitive and easy to design, it is practically possible to put a considerable burden on the dc power supply, and the lifetime of the dc power supply is reduced, even at risk.
Disclosure of Invention
The invention provides a power supply system and a control method thereof, which are used for solving the problem that the structure of the power supply system in the past bears too much burden when the load condition of each direct current source is changed.
The invention discloses a control method of a power supply system, which is suitable for controlling a power supply system with a plurality of current sources, wherein the current sources are connected in series. The control method of the power supply system comprises the following steps: measuring the voltage difference of two connecting ends of each current source to obtain a plurality of voltage difference signals; calculating a voltage equalizing signal according to the voltage difference signals; and generating a plurality of correction signals according to the voltage equalizing signal and the voltage difference signals to respectively adjust a plurality of output currents of the current sources, wherein the correction signals are respectively related to a plurality of differences between the signal value of the voltage equalizing signal and the signal value of the voltage difference signals.
The invention discloses a power supply system. The power supply system has a plurality of current sources and a voltage equalizing control circuit. Each current source has two connections. The current sources are connected in series with each other at the connection terminals. There is a voltage difference between the two connection terminals of each current source. The voltage equalizing control circuit is electrically connected with the current sources respectively. The voltage equalizing control circuit is used for generating a voltage equalizing signal according to the voltage differences. The voltage equalizing signal indicates an average voltage difference. The voltage equalizing control circuit is used for generating a plurality of correction signals according to a plurality of differences between the voltage differences and the average voltage difference. Each correction signal is used for indicating one of the current sources to adjust the output current.
The invention discloses a power supply system. The power supply system is provided with a plurality of current sources and a plurality of voltage equalizing control circuits. Each current source has two connections. The current sources are connected in series with each other at the connection terminals. There is a voltage difference between the two connection terminals of each current source. Each equalizing control circuit is electrically connected with the current sources respectively. Each voltage equalizing control circuit is used for generating a voltage equalizing signal according to the voltage differences. The voltage equalizing signals are used for indicating an average voltage difference, and each voltage equalizing control circuit is used for generating a correction signal according to a difference value between one of the voltage difference signals and the average voltage difference. Each correction signal is used for indicating one of the current sources to adjust the output current.
The foregoing description of the invention and the following description of embodiments are provided to illustrate and explain the spirit and principles of the invention and to provide a further explanation of the invention as set forth in the appended claims.
Drawings
Fig. 1 is a flowchart of a control method of a power supply system according to an embodiment of the invention.
FIG. 2A is a functional block diagram of a power supply system according to an embodiment of the invention.
FIG. 2B is a functional block diagram of a power supply system according to another embodiment of the invention.
Fig. 3 is an equivalent circuit model schematic diagram of a current source according to an embodiment of the invention.
Fig. 4A is a functional block diagram of a power supply system according to another embodiment of the invention.
Fig. 4B is a functional block diagram of a power supply system according to another embodiment of the invention.
FIG. 5 is a functional block diagram of a power supply system according to another embodiment of the invention.
FIG. 6 is a functional block diagram of a power supply system according to yet another embodiment of the present invention.
FIG. 7 is a functional block diagram of a power supply system according to yet another embodiment of the present invention.
Wherein, the reference numerals:
1-5 power supply system
12 A-52 a, 12 b-52 b, 12 c-52 c current sources
222A ', 222b ', 222c ' power supply circuits
224A ', 224b ', 224c ' third arithmetic circuitry
14-54 Voltage equalizing control circuit
242. 342, 542A, 542b, 542c first arithmetic circuit
244A, 244b, 244c, 344a, 344b, 344c, 544a, 544b, 544c second arithmetic circuitry
346A, 346b, 346c, 546a, 546b, 546c gain circuits
16A ', 16b', 16c ', 26a', 26b ', 26c', 26 a-56 a, 26 b-56 b, 26 c-56 c measuring circuits
E1 and E2 connecting ends
IS adjustable current circuit
L load
R equivalent resistance
Voltage difference signal of Sa, sb and Sc
Sav equalizing signal
Ska, skb, skc correction signal
Preliminary correction signals for Ska ', skb', skc
Detailed Description
The detailed features and advantages of the present invention will be set forth in the following detailed description of the embodiments, which is presented to enable those skilled in the art to make and use the invention, and the related objects and advantages of the present invention will be readily apparent to those skilled in the art from the present disclosure, claims and drawings. The following examples are presented to illustrate the aspects of the invention in further detail, but are not intended to limit the scope of the invention in any way.
Referring to fig. 1, fig. 1 is a flowchart of a control method of a power supply system according to an embodiment of the invention. The control method of the power supply system is suitable for controlling a power supply system with a plurality of current sources which are connected in series. The control method of the power supply system comprises the following steps: step S101, measuring the voltage difference between two connection ends of each current source to obtain a plurality of voltage difference signals; step S103, calculating a voltage equalizing signal according to the voltage difference signals; step S105, generating a plurality of correction signals according to the voltage equalizing signal and the voltage difference signals to respectively adjust a plurality of output currents of the current sources, wherein the correction signals are respectively associated with a plurality of differences between the signal values of the voltage equalizing signal and the signal values of the voltage difference signals.
Based on such control methods, the present invention further provides a plurality of different power supply systems. Referring to fig. 2A for illustrating one power supply system, fig. 2A is a functional block diagram of the power supply system according to an embodiment of the invention. The power supply system 1 has a plurality of current sources and a voltage equalizing control circuit 14. In this embodiment, the power supply system 1 has the current sources 12a, 12b, 12c as an example, but the number of the current sources of the power supply system 1 is not limited to this. The current sources 12a, 12b, 12c are connected in series with each other, and the current sources 12a, 12b, 12c are connected in series with the load L. Any one of the current sources 12a, 12b, 12c has two connections. The current sources 12a, 12b, 12c are connected in series with each other with these connections. There is a voltage difference between the two connections of any of the current sources 12a, 12b, 12c. In this embodiment, the two connection terminals of the current source 12a have a voltage difference Va, the two connection terminals of the current source 12b have a voltage difference Vb, and the two connection terminals of the current source 12c have a voltage difference Vc. The voltage equalizing control circuit 14 is electrically connected to the current sources 12a, 12b, 12c, respectively. In fig. 1, the connection relation between the elements in electric power is shown by thick lines, and the connection relation between the elements in communication to exchange information is shown by thin lines.
The voltage equalizing control circuit 14 is used for generating a voltage equalizing signal according to the voltage differences Va, vb and Vc. The voltage equalizing signal indicates an average voltage difference. In one embodiment, the average voltage difference is the arithmetic mean of the voltage differences Va, vb, vc. The voltage equalizing control circuit 14 is configured to generate a plurality of correction signals according to a plurality of differences between the plurality of voltage differences and the average voltage difference, wherein each correction signal is configured to instruct one of the current sources 12a, 12b, 12c to adjust the output current.
Referring to fig. 2B again, fig. 2B is a functional block diagram of a power supply system according to another embodiment of the invention. In the embodiment shown in fig. 2B, the power supply system 1' is substantially similar in architecture to the power supply system 1 described above. In the embodiment shown in fig. 2B, however, the power supply system 1 'further has measurement circuits 16a', 16B ', 16c'. The measuring circuits 16a ', 16b', 16c 'are electrically connected to the current sources 12a', 12b ', 12c', respectively. The measurement circuits 16a ', 16b', 16c 'are respectively configured to generate voltage difference signals Sa', sb ', sc' according to the voltage differences Va, vb, vc as described above.
Continuing the above, the voltage difference signal Sa ' is used for indicating the voltage difference Va, the voltage difference signal Sb ' is used for indicating the voltage difference Vb, and the voltage difference signal Sc ' is used for indicating the voltage difference Vc. In practice, the measurement circuits 16a ', 16b ', 16c ' may be implemented in the current sources 12a ', 12b ', 12c ', respectively, or the measurement circuits 16a ', 16b ', 16c ' may be implemented in the voltage equalizing control circuit 14', or the measurement circuits 16a ', 16b ', 16c ' may be elements independent of the current sources 12a ', 12b ', 12c ' and the voltage equalizing control circuit 14', which are not limited herein. The architecture shown in fig. 2B, i.e., the measurement circuits 16a ', 16B ', 16c ', are independent of the current sources 12a ', 12B ', 12c ' and the voltage equalizing control circuit 14', for the following description.
Referring to fig. 3 for further explanation of the current source 12a (the current source 12 a'), fig. 3 is an equivalent circuit model schematic diagram of the current source according to an embodiment of the invention. As shown in fig. 3, the current source 12a has, for example, an adjustable current circuit IS and an equivalent resistor R, and the adjustable current circuit IS connected in parallel to the equivalent resistor R. It should be noted that the equivalent resistor R IS an equivalent resistor of the entire circuit of the current source 12a, and does not mean that the current source 12a really has a resistor connected in parallel to the adjustable current circuit IS.
Referring to the circuit structure shown in fig. 3, when the current provided by the adjustable current circuit IS greater than the current required by the load L or the current required by the system, the redundant current flows through the current loop formed by the equivalent resistor R and the adjustable current circuit IS. At this time, in addition to the burden of the adjustable current circuit IS, the circuit of the current source 12a IS heated, and even burned, and this may occur in the current source 12b or the current source 12c. In another aspect, when the voltage or current flowing through the load L varies, the voltage or current variation of the load L affects the voltage across the current sources 12a, 12b, 12c, and affects the current flowing through the equivalent resistor R, thereby generating heat.
Accordingly, the voltage equalizing control circuit 14 is configured to control each current source so that each current source maintains voltage equalizing as much as possible. The voltage equalizing control circuit 14 is electrically connected to the current sources 12a, 12b, 12c and the measuring circuits 16a, 16b, 16c, respectively. The voltage-equalizing control circuit 14 is configured to generate a voltage-equalizing signal according to the voltage difference signals Sa, sb, sc, and the voltage-equalizing control circuit 14 is configured to generate the correction signal Ska, skb, skc according to the voltage difference signals Sa, sb, sc and a plurality of differences between the voltage-equalizing signals. The signal value of the voltage equalizing signal is, for example, an arithmetic average value or a weighted average value of the signal values of the voltage difference signals. The signal value of one of the correction signals is related to the difference value between the voltage equalizing signal and the corresponding one of the voltage difference signals. In practice, the voltage equalizing control circuit 14 may be a stand-alone machine or a control board. Alternatively, the voltage equalizing control circuit 14 may be implemented in one of the current sources 12a, 12b, 12 c.
In an embodiment, at a corresponding time point, the signal value of the correction signal Ska is a difference between the signal values of the voltage difference signal Sa and the voltage equalizing signal, the signal value of the correction signal Skb is a difference between the signal values of the voltage difference signal Sb and the voltage equalizing signal, and the signal value of the correction signal Skc is a difference between the signal values of the voltage difference signal Sc and the voltage equalizing signal. The correction signal Ska, skb, skc is used to instruct a corresponding one of the current sources 12a, 12b, 12c to adjust the output current. After adjustment, the voltage difference between the two connection terminals of the current source 12a is substantially equal to the voltage difference between the two connection terminals of the current source 12b, and the voltage difference between the two connection terminals of the current source 12a is substantially equal to the voltage difference between the two connection terminals of the current source 12 c. So that the current sources 12a, 12b, 12c reach a voltage equalizing.
Referring to fig. 4A, fig. 4A is a functional block diagram of a power supply system according to another embodiment of the invention. In the embodiment shown in fig. 4A, the power supply system 2 is substantially identical in structure to the power supply system 1 described above. The difference is that the voltage equalizing control circuit 24 of the power supply system 2 has a first operation circuit 242 and a second operation circuit 244a, 244b, 244c. The second operation circuits 244a, 244b, 244c are electrically connected to the current sources 22a, 22b, 22c, respectively, and the second operation circuits 244a, 244b, 244c are electrically connected to the first operation circuit 242, respectively.
In this embodiment, when the first arithmetic circuit 242 obtains the voltage difference signals Sa, sb, sc, the first arithmetic circuit 242 is configured to generate the voltage equalizing signal Sav by performing arithmetic average on the signal values of the voltage difference signals Sa, sb, sc.
One of the second operation circuits 244a, 244b, 244c is used for comparing the voltage equalizing signal Sav with the corresponding voltage difference signal Sa, sb, sc to control the corresponding one of the current sources 22a, 22b, 22c to selectively adjust the output current. For example, the second operation circuit 244a is used for comparing the voltage equalizing signal Sav with the voltage difference signal Sa, and the second operation circuit 244a is used for generating a correction signal Ska according to the comparison result to instruct the current source 22a to adjust the output current. In one embodiment, the second operation circuit 244a is configured to subtract the signal value of the voltage equalizing signal Sav from the signal value of the voltage difference signal Sa to generate the correction signal Ska.
For example, when the signal value of the voltage difference signal Sa is greater than the signal value of the voltage equalizing signal Sav, the second operation circuit 244a' instructs the current source 22a to decrease the output current according to the correction signal Ska, thereby decreasing the current flowing through the equivalent resistor of the current source 22a and decreasing the voltage difference across the current source. Conversely, when the signal value of the voltage difference signal Sa is smaller than the signal value of the voltage equalizing signal Sav, the second operation circuit 244a 'instructs the current source 22a to increase the output current with the correction signal Ska, thereby increasing the current flowing through the equivalent resistor of the current source 22a', and decreasing the voltage difference across the current source.
Referring to fig. 4B, fig. 4B is a functional block diagram of a power supply system according to another embodiment of the invention. In the embodiment shown in fig. 4B, the current sources 22a ', 22B ', 22c ' further have power supply circuits 222a ', 222B ', 222c ' and third operation circuits 224a ', 224B ', 224c ', respectively. The power supply circuits 222a ', 222b', 222c 'are electrically connected to the third operation circuits 224a', 224b ', 224c', respectively. The power supply circuits 222a ', 222b ', 222c ' are configured to provide the output currents as described above, respectively. In addition, taking the current source 22a 'as an example, the third operation circuit 224a' of the current source 22a 'is used for indicating the power supply circuit 222a' to adjust the output current according to the reference signal Iref and the voltage difference signal Sa. The third operation circuit 224a' is, for example, a current-controlled current source and is controlled by a reference signal Sref. The reference signal Sref is, for example, a current signal or a voltage signal, which is not limited herein. For example, the power supply circuit 222a ' is a current-controlled current source, and the third operation circuit 224a ' is configured to adjust the current level of the reference signal Sref according to the correction signal Ska, and provide the adjusted reference signal Sref to the power supply circuit 222a '. The operation of the current source 22b 'and the current source 22c' can be similar, and will not be described again.
Referring to fig. 5, fig. 5 is a functional block diagram of a power supply system according to another embodiment of the invention. In the embodiment shown in fig. 5, the circuit structure of the power supply system 3 is substantially similar to that of the power supply system 2 described above, and details thereof are not repeated herein. The difference is that the equalizing control circuit 34 of the power supply system 3 further has gain circuits 346a, 346b, 346c. The gain circuits 346a, 346b, 346c are electrically connected to the second computing circuits 344a, 344b, 344c, respectively, and the gain circuits 346a, 346b, 346c are electrically connected to the computing circuit 342, respectively. Gain circuits 346a, 346b, 346c each correspond to one of a plurality of weight gains. In one embodiment, the rated powers of the current sources 32a, 32b, 32c are different, the weight gain corresponding to the gain circuit 346a is the ratio of the rated power of the current source 32a to the total rated power of the current sources 32a, 32b, 32c, the weight gain corresponding to the gain circuit 346b is the ratio of the rated power of the current source 32b to the total rated power of the current sources 32a, 32b, 32c, and the weight gain corresponding to the gain circuit 346c is the ratio of the rated power of the current source 32c to the total rated power of the current sources 32a, 32b, 32 c. The above is exemplary only, and is applicable to all current sources where the power rating of some of the current sources is the same.
In this embodiment, the second operation circuit 344a is configured to generate the preliminary correction signal Ska' according to the voltage equalizing signal Sav and the voltage difference signal Sa. Similarly, the second computing circuit 344b is configured to generate the preliminary correction signal Skb 'according to the voltage-equalizing signal Sav and the voltage-difference signal Sb, and the second computing circuit 344c is configured to generate the preliminary correction signal Ska' according to the voltage-equalizing signal Sav and the voltage-difference signal Sc. The second computing circuits 344a, 344b, 344c generate the preliminary correction signals Ska ', skb ', skc ' according to the voltage-sharing signal Sav and the voltage-difference signals Sa, sb, sc similarly to the second computing circuit 244a generating the correction signal Ska according to the voltage-sharing signal Sav and the voltage-difference signal Sa, which will not be described herein.
The gain circuits 346a, 346b, 346c are configured to adjust the preliminary correction signals Ska ', skb ', skc ' according to the corresponding weight gains, respectively, to generate the correction signals Ska, skb, skc, respectively. For example, the gain circuit 346a multiplies the signal value of the preliminary correction signal Ska' by a corresponding gain (the ratio of the rated power of the current source 32a to the total rated power of the current sources 32a, 32b, 32 c) to generate the correction signal Ska by the gain circuit 346 a. The correction signal Ska is used to instruct the current source 322a to adjust the corresponding output current. In practice, the gains of the gain circuits 346a, 346b, 346c may be preset, dynamically adjustable, and not limited thereto.
Fig. 6 is a functional block diagram illustrating a power supply system according to still another embodiment of the present invention. In the embodiment shown in fig. 6, the structure of the power supply system 4 is substantially similar to that of the power supply system 1 described above, and the details thereof will not be repeated. The power supply system 4 is different from the power supply system 1 in that the power supply system 4 has a plurality of voltage equalizing control circuits, and the voltage equalizing control circuits 44a, 44b, 44c are exemplified herein. The voltage equalizing control circuits 44a, 44b, 44c are electrically connected to the current sources 42a, 42b, 42c, respectively. The voltage equalizing control circuits 44a, 44b, 44c are configured to generate the correction signals Ska, skb, skc according to the voltage difference signals Sa, sb, sc, respectively, to instruct the current sources 42a, 42b, 42c to adjust the output currents, respectively.
In practice, the voltage equalizing control circuits 44a, 44b, 44c may be a plurality of independent machines or a plurality of independent control boards. In another embodiment, since the control method of the power supply system according to the present invention performs the related determination and control according to the voltage difference signals of the current sources, the voltage-sharing control circuits 44a, 44b, 44c can also be implemented in the current sources 42a, 42b, 42c respectively, instead of being implemented as independent machines or control boards, as long as the voltage difference signals Sa, sb, sc of the current sources are provided to the voltage-sharing control circuits 44a, 44b, 44 c. From another aspect, the output current of each current source can be adjusted by obtaining the required voltage difference signal, so as to achieve the effect of equalizing voltage of each current source. In this embodiment, the current sources 42a, 42b, 42c need not be intentionally set as active controllers (masters) or passive controllers (slave). In this way, in addition to making the control steps simpler, each current source 42a, 42b, 42c can also maintain its own independence, avoiding the situation that one current source goes wrong and is involved in other current sources.
Referring to fig. 7, fig. 7 is a functional block diagram of a power supply system according to still another embodiment of the invention. In the embodiment shown in fig. 7, the structure of the power supply system 5 is substantially similar to that of the power supply system 4, and details thereof will not be repeated. The power supply system 5 is different from the power supply system 4 in that the voltage equalizing control circuits 54a, 54b, 54c of the power supply system 5 have first operation circuits 542a, 542b, 542c, second operation circuits 544a, 544b, 544c, and gain circuits 546a, 546b, 546c, respectively. For the voltage equalizing control circuit 54a, the gain circuit 546a is electrically connected to the second operation circuit 544a, and the gain circuit 546a is also electrically connected to the current source 522a.
In view of the foregoing, the present invention provides a power supply system and a control method of the power supply system. In the power supply system, the power supply system is provided with a plurality of current sources connected in series, and the voltage equalizing control circuit of the power supply system adjusts the output current of each current source according to the voltage difference signal and the voltage equalizing signal. Therefore, even under the condition that the current sources are connected in series, when the terminal voltage of the load changes, the voltage difference of the two ends of each current source is the same, namely each current source is voltage-sharing. On the other hand, when the terminal voltage of the load changes, the voltage difference signal and the voltage equalizing signal can bear the voltage change of the load by all the current sources together, so that a single current source or a few current sources are prevented from bearing all the changes.
While the invention has been disclosed in terms of the foregoing embodiments, it is not intended to be limited thereto. Changes and modifications can be made without departing from the spirit and scope of the invention, and the invention is not limited to the above-described embodiments. Reference is made to the appended claims for a review of the scope of the invention as defined in the specification.
Claims (11)
1. A control method of a power supply system, which is suitable for controlling a power supply system having a plurality of current sources connected in series, the control method comprising:
Measuring the voltage difference of two connecting ends of each current source to obtain a plurality of voltage difference signals;
Calculating a voltage equalizing signal according to the voltage difference signals, wherein the voltage equalizing signal indicates an average voltage difference of the voltage difference signals; and
And generating a plurality of correction signals according to the voltage equalizing signal and the voltage difference signals to respectively adjust a plurality of output currents of the current sources, so that each current source achieves voltage equalizing, and the correction signals are respectively related to a plurality of differences between the signal values of the voltage equalizing signal and the signal values of the voltage difference signals.
2. The method according to claim 1, wherein the current sources have different power ratings, and the step of generating the correction signals according to the voltage equalizing signal and the voltage difference signals further comprises:
Respectively adjusting the equalizing signals according to a plurality of weight gains to generate a plurality of compensating equalizing signals, wherein one of the weight gains is the ratio of the rated power of a corresponding current source in the current sources to the total rated power of the current sources; and
Comparing one of the compensation voltage equalizing signals with a corresponding voltage difference signal in the voltage difference signals to generate a corresponding correction signal;
The correction signal is used for controlling a voltage source which generates the corresponding voltage difference signal in the current sources to adjust the output current.
3. The method according to claim 2, wherein the current sources are controlled by a plurality of control currents respectively, and the control currents are adjusted according to the correction signals in the step of comparing one of the correction signals with a corresponding one of the voltage difference signals to control the voltage sources generating the corresponding voltage difference signal among the current sources to adjust the output current.
4. A power supply system, comprising:
the current sources are connected in series with each other by the connecting ends, and a voltage difference is arranged between the two connecting ends of each current source; and
The voltage-sharing control circuit is used for generating a voltage-sharing signal according to the voltage differences, the voltage-sharing signal indicates an average voltage difference of the voltage differences, the voltage-sharing control circuit is used for generating a plurality of correction signals according to a plurality of differences between the voltage differences and the average voltage differences, and each correction signal is used for indicating one of the current sources to adjust the output current, so that each current source achieves voltage sharing.
5. The power supply system of claim 4, wherein the voltage equalizing control circuit further comprises:
The first operation circuit is electrically connected with the current sources respectively and is used for generating the voltage equalizing signal according to the voltage difference; and
The second operation circuits are respectively and electrically connected with the first operation circuit, and one of the second operation circuits is used for subtracting one corresponding to the voltage difference from the voltage equalizing signal so as to generate the corresponding correction signal.
6. The power supply system of claim 4, wherein the current sources have different power ratings, and the voltage equalizing control circuit further comprises:
The first operation circuit is electrically connected with the current sources respectively and is used for generating the voltage equalizing signal according to the voltage difference;
The second operation circuits are respectively and electrically connected with the first operation circuit, and one of the second operation circuits is used for subtracting one corresponding to the voltage difference from the voltage equalizing signal so as to generate a corresponding primary correction signal; and
The gain circuits are electrically connected with one of the second operation circuits corresponding to the gain circuits, each gain circuit corresponds to one of the weight gains, and the gain circuits are used for adjusting the corresponding preliminary correction signals according to the corresponding weight gains to generate the correction signals;
One of the weight gains is the ratio of the rated power of one of the current sources to the total rated power of the current sources.
7. The power supply system of claim 4, wherein one of the current sources comprises:
the third operation circuit is electrically connected with the voltage equalizing control circuit and is used for adjusting the current magnitude of a reference current according to the corresponding correction signal; and
The power supply module is electrically connected with the third operation circuit and is used for providing output current according to the reference current regulated by the third operation circuit.
8. A power supply system, comprising:
The current sources are connected in series with each other by the connecting ends, and a voltage difference is arranged between the two connecting ends of each current source;
Each voltage-sharing control circuit is electrically connected with the current sources respectively, each voltage-sharing control circuit is used for generating a voltage-sharing signal according to the voltage differences, the voltage-sharing signal is used for indicating an average voltage difference of the voltage differences, each voltage-sharing control circuit is used for generating a correction signal according to a difference value between one of the voltage differences corresponding to the voltage differences and the average voltage difference, and each correction signal is used for indicating one of the current sources corresponding to the correction signal to adjust the output current, so that each current source achieves voltage sharing.
9. The power supply system of claim 8, wherein one of the voltage equalizing control circuits further comprises:
The first operation circuit is electrically connected with the current sources respectively and is used for generating the voltage equalizing signal according to the voltage difference; and
The second operation circuit is electrically connected with the first operation circuit and is used for subtracting the voltage difference from the voltage equalizing signal so as to generate the corresponding correction signal.
10. The power supply system of claim 8, wherein the current sources each have different power ratings, and one of the voltage equalizing control circuits comprises:
The first operation circuit is electrically connected with the current sources respectively and is used for generating the voltage equalizing signal according to the voltage difference; and
The second operation circuit is electrically connected with the first operation circuit and is used for subtracting the voltage equalizing signal from the corresponding voltage difference so as to generate a corresponding primary correction signal;
the gain circuit is electrically connected with the second operation circuit and is used for adjusting the preliminary correction signal according to one of a plurality of weight gains so as to generate the corresponding correction signal; and
The weight gain is the ratio of the rated power of the current source electrically connected with the voltage equalizing control circuit to the total power of the rated powers of the current sources.
11. The power supply system of claim 8, wherein the current sources are respectively controlled by a plurality of control currents, each voltage equalizing control circuit is configured to adjust a current value of one of the control currents by one of the correction signals, and one of the current sources comprises:
The third operation circuit is electrically connected with the corresponding voltage equalizing control circuit and is used for adjusting the current of a reference current according to the correction signal provided by the corresponding voltage equalizing control circuit; and
The power supply module is electrically connected with the third operation circuit and is used for providing output current according to the reference current regulated by the third operation circuit.
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| CN201711024345.0A CN109728577B (en) | 2017-10-27 | 2017-10-27 | Power supply system and control method thereof |
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| CN201711024345.0A CN109728577B (en) | 2017-10-27 | 2017-10-27 | Power supply system and control method thereof |
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